My Tibook has some problems with sleep mode. about 75% of the time when i awake my computer it will act frozen and will not open any programs. I use itunes whenever i awaken it to see if it is acting up again. I ask it to play a song and it will freeze for a moment and then the "intense operation" mouse will come up. once i let it go for about half an hour and it returned the warning about my library file not working b/c i logged out. and nothing else works. i cant logout to login. The time will be frozen from somewhere in the middle from when i put it to sleep and awoke it. I cant shut it down, have to do so manually with a key combo. Anybody hear anything about this or have experienced it also?